Fix linux form element styling (#5467)

Closes #5435

chrome/content/zotero/customElements.js

@@ -337,7 +337,12 @@ Services.scriptloader.loadSubScript('chrome://zotero/content/elements/itemTreeMe
 				patchedFunction: "connectedCallback",
 			}
 		],
-		linux: [],
+		linux: [
+			{
+				element: "dialog",
+				patchedFunction: "connectedCallback"
+			}
+		],
 	};
 	for (let [key, configs] of Object.entries(InjectCSSConfig)) {
 		if (key == "win" && !Zotero.isWin) continue;

scss/_zotero.scss

@@ -38,6 +38,7 @@
 @import "components/editBibliographyDialog";
 @import "components/exportOptions";
 @import "components/feedSettings";
+@import "components/input";
 @import "components/icons";
 @import "components/import-wizard";
 @import "components/item-tree";
@@ -46,6 +47,7 @@
 @import "components/longTagFixer";
 @import "components/mainWindow";
 @import "components/menu";
+@import "components/menulist";
 @import "components/notesList";
 @import "components/progressMeter";
 @import "components/publications-dialog";

scss/components/_button.scss

@@ -37,4 +37,12 @@ button {
 		max-height: 25px;
 		margin: 0 -2px -1px;
 	}
+	
+	@media (-moz-platform: linux) {
+		// fx140 form element styling fix
+		appearance: none;
+		border-radius: 5px;
+		border-color: ThreeDShadow;
+		padding: 0.3em 1.5em;
+	}
 }

scss/components/_input.scss

@@ -0,0 +1,13 @@
+input {
+	@media (-moz-platform: linux) {
+		// fx140 form element styling fix
+		appearance: none;
+		border-radius: 5px;
+		padding: .3em .5em;
+		border: 1px solid ThreeDShadow;
+		
+		&[type="button"] {
+			padding: .3em 1.5em;
+		}
+	}
+}

scss/components/_menulist.scss

@@ -0,0 +1,10 @@
+menulist {
+	@media (-moz-platform: linux) {
+		// fx140 form element styling fix
+		appearance: none;
+		border-radius: 5px;
+		border-color: ThreeDShadow;
+		padding: .3em .5em;
+		background: var(--arrowpanel-background);
+	}
+}

scss/preferences.scss

@@ -22,8 +22,10 @@
 
 @import "components/button";
 @import "components/icons";
+@import "components/input";
 @import "components/listheader";
 @import "components/menu";
+@import "components/menulist";
 @import "components/richlistbox";
 @import "components/search";
 @import "components/spinner";

scss/xulElementPatches/dialog-unix.scss

@@ -0,0 +1,22 @@
+// Override/enhance mozilla <dialog> styles. See customElements.js
+@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
+@namespace html url("http://www.w3.org/1999/xhtml");
+
+@import "../abstracts/variables";
+@import "../abstracts/functions";
+@import "../abstracts/mixins";
+@import "../abstracts/placeholders";
+@import "../abstracts/utilities";
+@import "../abstracts/split-button";
+@import "../abstracts/svgicon";
+
+@import "../themes/light";
+@import "../themes/dark";
+
+// Base
+// --------------------------------------------------
+
+@import "../base/base";
+
+@import "../components/button";
+@import "../components/input";