fix(scroll): improve flicker on back navigation (#756)

* fix(scroll): improve flicker on back navigation

It's still not perfect in Firefox for Android, but it's improved.

Partial fix for #753

* the double raf makes no difference here

routes/_components/compose/ComposeBox.html

@@ -15,7 +15,10 @@
   <ComposeLengthIndicator {length} {overLimit} />
   <ComposeMedia {realm} {media} />
 </div>
-<ComposeStickyButton {showSticky} {hideAndFadeIn} {overLimit} on:postAction="doPostStatus()" />
+<ComposeStickyButton {showSticky}
+                     {overLimit}
+                     {hideAndFadeIn}
+                     on:postAction="doPostStatus()" />
 {#if !hideBottomBorder}
   <div class="compose-box-border-bottom {hideAndFadeIn}"></div>
 {/if}

routes/_components/compose/ComposeStickyButton.html

@@ -1,4 +1,4 @@
-<div class="compose-box-button-sentinel {hideAndFadeIn}" ref:sentinel></div>
+<div class="compose-box-button-sentinel" ref:sentinel></div>
 <div class="compose-box-button-wrapper {showSticky ? 'compose-box-button-sticky' : ''} {hideAndFadeIn}"
      ref:wrapper >
   <ComposeButton {overLimit} {sticky} on:click="onClickButton()" />

routes/_components/virtualList/VirtualListContainer.html

@@ -34,6 +34,7 @@
           let { initializedScrollTop } = this.get()
           if (!initializedScrollTop && allVisibleItemsHaveHeight) {
             this.set({ 'initializedScrollTop': true })
+            requestAnimationFrame(() => {
               mark('set scrollTop')
               console.log('forcing scroll top to ', scrollTop)
               scrollContainer.scrollTop = scrollTop
@@ -42,6 +43,7 @@
                 console.log('initialized VirtualList')
                 this.fire('initialized')
               })
+            })
           }
         })
       } else {

scss/global.scss

@@ -62,6 +62,7 @@ main {
   min-height: 70vh;
   @media (max-width: 767px) {
     margin: 5px auto 15px;
+    min-height: 100vh;
   }
 }
 

templates/2xx.html

@@ -17,7 +17,7 @@
   <!-- begin inline CSS -->
 <style>
 :root{--button-primary-bg: #6081e6;--button-primary-text: #fff;--button-primary-border: #132c76;--button-primary-bg-active: #456ce2;--button-primary-bg-hover: #6988e7;--button-bg: #e6e6e6;--button-text: #333;--button-border: #a7a7a7;--button-bg-active: #bfbfbf;--button-bg-hover: #f2f2f2;--input-border: #dadada;--input-bg: #fff;--anchor-text: #4169e1;--main-bg: #fff;--body-bg: #e8edfb;--body-text-color: #333;--main-border: #dadada;--svg-fill: #4169e1;--form-bg: #f7f7f7;--form-border: #c1c1c1;--nav-bg: #4169e1;--nav-border: #214cce;--nav-a-border: #4169e1;--nav-a-selected-border: #fff;--nav-a-selected-bg: #6d8ce8;--nav-svg-fill: #fff;--nav-text-color: #fff;--nav-a-selected-border-hover: #fff;--nav-a-selected-bg-hover: #839deb;--nav-a-bg-hover: #577ae4;--nav-a-border-hover: #4169e1;--nav-svg-fill-hover: #fff;--nav-text-color-hover: #fff;--action-button-fill-color: #90a8ee;--action-button-fill-color-hover: #a2b6f0;--action-button-fill-color-active: #577ae4;--action-button-fill-color-pressed: #2351dc;--action-button-fill-color-pressed-hover: #3862e0;--action-button-fill-color-pressed-active: #1d44b8;--action-button-deemphasized-fill-color: #666;--action-button-deemphasized-fill-color-hover: #9e9e9e;--action-button-deemphasized-fill-color-active: #737373;--action-button-deemphasized-fill-color-pressed: #545454;--action-button-deemphasized-fill-color-pressed-hover: #616161;--action-button-deemphasized-fill-color-pressed-active: #404040;--settings-list-item-bg: #fff;--settings-list-item-text: #4169e1;--settings-list-item-text-hover: #4169e1;--settings-list-item-border: #dadada;--settings-list-item-bg-active: #e6e6e6;--settings-list-item-bg-hover: #fafafa;--toast-bg: #333;--toast-border: #fafafa;--toast-text: #fff;--mask-bg: #333;--mask-svg-fill: #fff;--mask-opaque-bg: rgba(51,51,51,0.8);--loading-bg: #ededed;--account-profile-bg-backdrop-filter: rgba(255,255,255,0.7);--account-profile-bg: rgba(255,255,255,0.9);--deemphasized-text-color: #666;--focus-outline: #c5d1f6;--very-deemphasized-link-color: rgba(65,105,225,0.6);--very-deemphasized-text-color: rgba(102,102,102,0.6);--status-direct-background: #d2dcf8;--main-theme-color: #4169e1;--warning-color: #e01f19;--alt-input-bg: rgba(255,255,255,0.7);--muted-modal-bg: transparent;--muted-modal-focus: #999;--muted-modal-hover: rgba(255,255,255,0.2);--compose-autosuggest-item-hover: #ced8f7;--compose-autosuggest-item-active: #b8c7f4;--compose-autosuggest-outline: #dbe3f9;--compose-button-halo: rgba(255,255,255,0.1)}:root{--scrollbar-face-color: #90a8ee;--scrollbar-track-color: #dbe3f9;--scrollbar-border-radius: 0;--scrollbar-face-color-hover: #99afef;--scrollbar-face-color-active: #839deb;--scrollbar-width: 12px;--scrollbar-height: 12px;--scrollbar-background-color: transparent}
-@font-face{font-family:PinaforeRegular;src:local("BlinkMacSystemFont"),local("Segoe UI"),local("Roboto"),local("Oxygen-Sans"),local("Ubuntu"),local("Cantarell"),local("Fira Sans"),local("Droid Sans"),local("Helvetica Neue")}@font-face{font-family:PinaforeEmoji;src:local("Apple Color Emoji"),local("Segoe UI Emoji"),local("Segoe UI Symbol"),local("Twemoji Mozilla"),local("Noto Color Emoji"),local("EmojiOne Color"),local("Android Emoji")}body{margin:0;font-family:system-ui, -apple-system, PinaforeRegular, sans-serif;font-size:14px;line-height:1.4;color:var(--body-text-color);background:var(--body-bg);-webkit-tap-highlight-color:transparent;overflow-x:hidden}.main-content{contain:content;padding-top:42px}@supports (-webkit-overflow-scrolling: touch){.main-content{overflow-x:hidden}}@media (max-width: 991px){.main-content{padding-top:52px}}@media (max-width: 767px){.main-content{padding-top:62px}}main{position:relative;width:602px;max-width:100vw;padding:0;box-sizing:border-box;margin:30px auto 15px;background:var(--main-bg);border:1px solid var(--main-border);border-radius:1px;min-height:70vh}@media (max-width: 767px){main{margin:5px auto 15px}}footer{width:602px;max-width:100vw;box-sizing:border-box;margin:15px auto;border-radius:1px;background:var(--main-bg);font-size:0.9em;padding:20px;border:1px solid var(--main-border)}h1,h2,h3,h4,h5,h6{margin:0 0 0.5em 0;font-weight:400;line-height:1.2}h1{font-size:2em}a{color:var(--anchor-text);text-decoration:none}a:visited{color:var(--anchor-text)}a:hover{text-decoration:underline}input{border:1px solid var(--input-border);padding:5px;box-sizing:border-box}input[type=search]{-webkit-appearance:none}input,textarea{background:inherit;color:inherit}textarea{font-family:system-ui, -apple-system, PinaforeRegular, sans-serif, PinaforeEmoji}button,.button{font-size:1.2em;background:var(--button-bg);border-radius:2px;padding:10px 15px;border:1px solid var(--button-border);cursor:pointer;color:var(--button-text)}button:hover,.button:hover{background:var(--button-bg-hover);text-decoration:none}button:active,.button:active{background:var(--button-bg-active)}button[disabled],.button[disabled]{opacity:0.35;pointer-events:none;cursor:not-allowed}button.primary,.button.primary{border:1px solid var(--button-primary-border);background:var(--button-primary-bg);color:var(--button-primary-text)}button.primary:hover,.button.primary:hover{background:var(--button-primary-bg-hover)}button.primary:active,.button.primary:active{background:var(--button-primary-bg-active)}p,label,input{font-size:1.3em}ul,li,p{padding:0;margin:0}.hidden{opacity:0}*:focus{outline:2px solid var(--focus-outline)}.container:focus{outline:none}button::-moz-focus-inner{border:0}input:required,input:invalid{box-shadow:none}textarea{font-family:inherit;font-size:inherit;box-sizing:border-box}@keyframes spin{0%{transform:rotate(0deg)}25%{transform:rotate(90deg)}50%{transform:rotate(180deg)}75%{transform:rotate(270deg)}100%{transform:rotate(360deg)}}.spin{animation:spin 1.5s infinite linear}.ellipsis::after{content:"\2026"}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0, 0, 0, 0);border:0}.inline-custom-emoji{width:1.4em;height:1.4em;margin:-0.1em 0;object-fit:contain;vertical-align:middle}.inline-emoji{font-family:PinaforeEmoji, sans-serif}
+@font-face{font-family:PinaforeRegular;src:local("BlinkMacSystemFont"),local("Segoe UI"),local("Roboto"),local("Oxygen-Sans"),local("Ubuntu"),local("Cantarell"),local("Fira Sans"),local("Droid Sans"),local("Helvetica Neue")}@font-face{font-family:PinaforeEmoji;src:local("Apple Color Emoji"),local("Segoe UI Emoji"),local("Segoe UI Symbol"),local("Twemoji Mozilla"),local("Noto Color Emoji"),local("EmojiOne Color"),local("Android Emoji")}body{margin:0;font-family:system-ui, -apple-system, PinaforeRegular, sans-serif;font-size:14px;line-height:1.4;color:var(--body-text-color);background:var(--body-bg);-webkit-tap-highlight-color:transparent;overflow-x:hidden}.main-content{contain:content;padding-top:42px}@supports (-webkit-overflow-scrolling: touch){.main-content{overflow-x:hidden}}@media (max-width: 991px){.main-content{padding-top:52px}}@media (max-width: 767px){.main-content{padding-top:62px}}main{position:relative;width:602px;max-width:100vw;padding:0;box-sizing:border-box;margin:30px auto 15px;background:var(--main-bg);border:1px solid var(--main-border);border-radius:1px;min-height:70vh}@media (max-width: 767px){main{margin:5px auto 15px;min-height:100vh}}footer{width:602px;max-width:100vw;box-sizing:border-box;margin:15px auto;border-radius:1px;background:var(--main-bg);font-size:0.9em;padding:20px;border:1px solid var(--main-border)}h1,h2,h3,h4,h5,h6{margin:0 0 0.5em 0;font-weight:400;line-height:1.2}h1{font-size:2em}a{color:var(--anchor-text);text-decoration:none}a:visited{color:var(--anchor-text)}a:hover{text-decoration:underline}input{border:1px solid var(--input-border);padding:5px;box-sizing:border-box}input[type=search]{-webkit-appearance:none}input,textarea{background:inherit;color:inherit}textarea{font-family:system-ui, -apple-system, PinaforeRegular, sans-serif, PinaforeEmoji}button,.button{font-size:1.2em;background:var(--button-bg);border-radius:2px;padding:10px 15px;border:1px solid var(--button-border);cursor:pointer;color:var(--button-text)}button:hover,.button:hover{background:var(--button-bg-hover);text-decoration:none}button:active,.button:active{background:var(--button-bg-active)}button[disabled],.button[disabled]{opacity:0.35;pointer-events:none;cursor:not-allowed}button.primary,.button.primary{border:1px solid var(--button-primary-border);background:var(--button-primary-bg);color:var(--button-primary-text)}button.primary:hover,.button.primary:hover{background:var(--button-primary-bg-hover)}button.primary:active,.button.primary:active{background:var(--button-primary-bg-active)}p,label,input{font-size:1.3em}ul,li,p{padding:0;margin:0}.hidden{opacity:0}*:focus{outline:2px solid var(--focus-outline)}.container:focus{outline:none}button::-moz-focus-inner{border:0}input:required,input:invalid{box-shadow:none}textarea{font-family:inherit;font-size:inherit;box-sizing:border-box}@keyframes spin{0%{transform:rotate(0deg)}25%{transform:rotate(90deg)}50%{transform:rotate(180deg)}75%{transform:rotate(270deg)}100%{transform:rotate(360deg)}}.spin{animation:spin 1.5s infinite linear}.ellipsis::after{content:"\2026"}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0, 0, 0, 0);border:0}.inline-custom-emoji{width:1.4em;height:1.4em;margin:-0.1em 0;object-fit:contain;vertical-align:middle}.inline-emoji{font-family:PinaforeEmoji, sans-serif}
 </style>
 <style media="only x" id="theOfflineStyle">
 :root{--button-primary-bg: #ababab;--button-primary-text: #fff;--button-primary-border: #4d4d4d;--button-primary-bg-active: #9c9c9c;--button-primary-bg-hover: #b0b0b0;--button-bg: #e6e6e6;--button-text: #333;--button-border: #a7a7a7;--button-bg-active: #bfbfbf;--button-bg-hover: #f2f2f2;--input-border: #dadada;--input-bg: #fff;--anchor-text: #999;--main-bg: #fff;--body-bg: #fafafa;--body-text-color: #333;--main-border: #dadada;--svg-fill: #999;--form-bg: #f7f7f7;--form-border: #c1c1c1;--nav-bg: #999;--nav-border: gray;--nav-a-border: #999;--nav-a-selected-border: #fff;--nav-a-selected-bg: #b3b3b3;--nav-svg-fill: #fff;--nav-text-color: #fff;--nav-a-selected-border-hover: #fff;--nav-a-selected-bg-hover: #bfbfbf;--nav-a-bg-hover: #a6a6a6;--nav-a-border-hover: #999;--nav-svg-fill-hover: #fff;--nav-text-color-hover: #fff;--action-button-fill-color: #c7c7c7;--action-button-fill-color-hover: #d1d1d1;--action-button-fill-color-active: #a6a6a6;--action-button-fill-color-pressed: #878787;--action-button-fill-color-pressed-hover: #949494;--action-button-fill-color-pressed-active: #737373;--action-button-deemphasized-fill-color: #666;--action-button-deemphasized-fill-color-hover: #9e9e9e;--action-button-deemphasized-fill-color-active: #737373;--action-button-deemphasized-fill-color-pressed: #545454;--action-button-deemphasized-fill-color-pressed-hover: #616161;--action-button-deemphasized-fill-color-pressed-active: #404040;--settings-list-item-bg: #fff;--settings-list-item-text: #999;--settings-list-item-text-hover: #999;--settings-list-item-border: #dadada;--settings-list-item-bg-active: #e6e6e6;--settings-list-item-bg-hover: #fafafa;--toast-bg: #333;--toast-border: #fafafa;--toast-text: #fff;--mask-bg: #333;--mask-svg-fill: #fff;--mask-opaque-bg: rgba(51,51,51,0.8);--loading-bg: #ededed;--account-profile-bg-backdrop-filter: rgba(255,255,255,0.7);--account-profile-bg: rgba(255,255,255,0.9);--deemphasized-text-color: #666;--focus-outline: #bfbfbf;--very-deemphasized-link-color: rgba(153,153,153,0.6);--very-deemphasized-text-color: rgba(102,102,102,0.6);--status-direct-background: #ededed;--main-theme-color: #999;--warning-color: #e01f19;--alt-input-bg: rgba(255,255,255,0.7);--muted-modal-bg: transparent;--muted-modal-focus: #999;--muted-modal-hover: rgba(255,255,255,0.2);--compose-autosuggest-item-hover: #c4c4c4;--compose-autosuggest-item-active: #b8b8b8;--compose-autosuggest-outline: #ccc;--compose-button-halo: rgba(255,255,255,0.1)}:root{--scrollbar-face-color: #c7c7c7;--scrollbar-track-color: #f2f2f2;--scrollbar-border-radius: 0;--scrollbar-face-color-hover: #ccc;--scrollbar-face-color-active: #bfbfbf;--scrollbar-width: 12px;--scrollbar-height: 12px;--scrollbar-background-color: transparent}