Fix some UI problems (dropdown/container) (#30849)

Follow #30345
Follow #30547

`ellipsis` / `white-space` shouldn't be put on the general dropdown components.

web_src/css/base.css

@@ -342,8 +342,6 @@ a.label,
 
 .ui.dropdown .menu > .item {
   color: var(--color-text);
-  overflow: hidden;
-  text-overflow: ellipsis;
 }
 
 .ui.dropdown .menu > .item:hover {
@@ -374,7 +372,6 @@ a.label,
 
 .ui.selection.dropdown .menu > .item {
   border-color: var(--color-secondary);
-  white-space: nowrap;
 }
 
 .ui.selection.visible.dropdown > .text:not(.default) {
@@ -1342,7 +1339,11 @@ table th[data-sortt-desc] .svg {
   align-items: center;
   gap: .25rem;
   vertical-align: middle;
-  min-width: 0;
+  min-width: 0; /* make ellipsis work */
+}
+
+.ui.ui.dropdown.selection {
+  min-width: 14em; /* match the default min width */
 }
 
 .ui.dropdown .ui.label .svg {
@@ -1369,3 +1370,16 @@ table th[data-sortt-desc] .svg {
   gap: .5rem;
   min-width: 0;
 }
+
+.ui.dropdown.ellipsis-items-nowrap > .text {
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+}
+
+.ellipsis-items-nowrap > .item,
+.ui.dropdown.ellipsis-items-nowrap .menu > .item {
+  white-space: nowrap !important;
+  overflow: hidden !important;
+  text-overflow: ellipsis !important;
+}

web_src/css/form.css

@@ -448,6 +448,10 @@ textarea:focus,
   }
 }
 
+.ui.form .field > .selection.dropdown {
+  min-width: 14em; /* matches the default min width */
+}
+
 .new.webhook form .help {
   margin-left: 25px;
 }

web_src/css/modules/container.css

@@ -2,26 +2,20 @@
    unused rules here after refactoring, please remove them. */
 
 .ui.container {
-  display: block;
-  max-width: 100%;
-}
-
-.ui.fluid.container {
-  width: 100%;
-}
-
-.ui[class*="center aligned"].container {
-  text-align: center;
-}
-
-/* overwrite width of containers inside the main page content div (div with class "page-content") */
-.page-content .ui.ui.ui.container:not(.fluid) {
   width: 1280px;
   max-width: calc(100% - calc(2 * var(--page-margin-x)));
   margin-left: auto;
   margin-right: auto;
 }
 
+.ui.fluid.container {
+  width: 100%;
+}
+
 .ui.container.fluid.padded {
   padding: 0 var(--page-margin-x);
 }
+
+.ui[class*="center aligned"].container {
+  text-align: center;
+}

web_src/css/repo.css

@@ -2860,6 +2860,10 @@ tbody.commit-list {
   margin-top: 4px;
 }
 
+.ui.dropdown.branch-selector-dropdown .scrolling.menu {
+  max-width: min(400px, 90vw);
+}
+
 .branch-selector-dropdown .branch-dropdown-button {
   margin: 0;
   max-width: 340px;
@@ -2909,6 +2913,8 @@ tbody.commit-list {
 }
 
 .branch-selector-dropdown .menu .item .rss-icon {
+  position: absolute;
+  right: 4px;
   visibility: hidden; /* only show RSS icon on hover */
 }