Remove opacity changes from titlebar - fixes #331

Bug 1870803 introduced a transition to window activeness visuals. But
the lowered opacity breaks the z-index hackery we use to let
window-controls show through nav-bar.

This patch basically undoes the changes from bug 1870803

chrome/hide_tabs_toolbar.css

@@ -16,7 +16,11 @@ Window controls will be all wrong without it
 
 :root[tabsintitlebar]{ --uc-toolbar-height: 40px; }
 :root[tabsintitlebar][uidensity="compact"]{ --uc-toolbar-height: 32px }
-
+#titlebar{
+  will-change: unset !important;
+  transition: none !important;
+  opacity: 1 !important;
+}
 #TabsToolbar{ visibility: collapse !important }
 
 :root[sizemode="fullscreen"] #TabsToolbar > :is(#window-controls,.titlebar-buttonbox-container){

chrome/hide_tabs_toolbar_w_alltabs_button.css

@@ -40,4 +40,9 @@ See the above repository for updates as well as full license text. */
 #TabsToolbar > .titlebar-spacer{ display: none }
 #TabsToolbar:not([customizing]){ margin-bottom: calc(0px - var(--tab-min-height) - 2 * var(--tab-block-margin))}
 
-#titlebar{ -moz-appearance: none !important; }
+#titlebar{
+  -moz-appearance: none !important;
+  will-change: unset !important;
+  transition: none !important;
+  opacity: 1 !important;
+}

chrome/hide_tabs_with_one_tab_w_window_controls.css

@@ -20,7 +20,12 @@ Window controls will be all wrong without it
 :root{
   --uc-menubar-vertical-overlap: 28px; /* adjust as necessary */
 }
-#titlebar{ -moz-appearance: none !important; }
+#titlebar{
+  -moz-appearance: none !important;
+  will-change: unset !important;
+  transition: none !important;
+  opacity: 1 !important;
+}
 /* We'll use window controls from menubar instead */
 #TabsToolbar > .titlebar-buttonbox-container { display: none }
 /* Hide overflow button unless tabs overflow - is necessary for collpasing tabs with one tab */

chrome/navbar_tabs_oneliner_tabs_on_left.css

@@ -19,7 +19,11 @@ Window controls will be all wrong without it
   --uc-toolbar-height: 40px;
   --uc-urlbar-min-width: 50vw; /* minimum width for opened urlbar */
 }
-
+#titlebar{
+  will-change: unset !important;
+  transition: none !important;
+  opacity: 1 !important;
+}
 #scrollbutton-up,
 #scrollbutton-down{ border-block-width: 2px !important; }
 

chrome/tabs_below_content.css

@@ -19,7 +19,11 @@ linux_gtk_window_control_patch.css
   z-index: 3;
   visibility: visible !important;
 }
-
+#titlebar{
+  will-change: unset !important;
+  transition: none !important;
+  opacity: 1 !important;
+}
 @media (-moz-bool-pref: "userchrome.force-window-controls-on-left.enabled"),
        (-moz-gtk-csd-reversed-placement),
        (-moz-platform: macos){