Bug 1878701 - Part 2: Make DLP busy dialog have a gray Cancel button r=handyman,Gijs

This changes CommonDialog to allow having a button 1 (which is styled
like Cancel) without a button 0. (which is styled like OK)

Differential Revision: https://phabricator.services.mozilla.com/D200728

Author: gregstoll

browser/components/contentanalysis/content/ContentAnalysis.sys.mjs

@@ -497,6 +497,7 @@ export const ContentAnalysis = {
       }),
       Ci.nsIPromptService.BUTTON_POS_0 *
         Ci.nsIPromptService.BUTTON_TITLE_CANCEL +
+        Ci.nsIPromptService.BUTTON_POS_1_DEFAULT +
         Ci.nsIPromptService.SHOW_SPINNER,
       null,
       null,

toolkit/components/prompts/src/CommonDialog.sys.mjs

@@ -142,14 +142,18 @@ CommonDialog.prototype = {
     // This assumes that button0 defaults to a visible "ok" button, and
     // button1 defaults to a visible "cancel" button. The other 2 buttons
     // have no default labels (and are hidden).
+    this.ui.button3.disabled = true;
+    this.ui.button2.disabled = true;
     switch (this.numButtons) {
       case 4:
         this.setLabelForNode(this.ui.button3, this.args.button3Label);
         this.ui.button3.hidden = false;
+        this.ui.button3.disabled = false;
       // fall through
       case 3:
         this.setLabelForNode(this.ui.button2, this.args.button2Label);
         this.ui.button2.hidden = false;
+        this.ui.button2.disabled = false;
       // fall through
       case 2:
         // Defaults to a visible "cancel" button
@@ -160,6 +164,7 @@ CommonDialog.prototype = {
 
       case 1:
         this.ui.button1.hidden = true;
+        this.ui.button1.disabled = true;
         break;
     }
     // Defaults to a visible "ok" button