IDEA-78156 Make git branch max text a bit smaller, add ellipsis to the middle

Move shortenTextWithEllipsis to StringUtil

platform/util/src/com/intellij/openapi/util/text/StringUtil.java

@@ -2247,4 +2247,23 @@ public class StringUtil {
   public static boolean isOctalDigit(char c) {
     return '0' <= c && c <= '7';
   }
+
+  @NotNull
+  public static String shortenTextWithEllipsis(final String text, final int max_length, final int suffix_length) {
+    final int prefix_length = max_length - suffix_length - 3;
+    assert prefix_length > 0;
+    final StringBuilder buffer = new StringBuilder();
+    final int textLength = text.length();
+    if (textLength > max_length) {
+      StringBuilder shorterText = new StringBuilder();
+      shorterText.append(text.substring(0, prefix_length));
+      shorterText.append("...");
+      shorterText.append(text.substring(textLength - suffix_length));
+      buffer.append(shorterText.toString());
+    }
+    else {
+      buffer.append(text);
+    }
+    return buffer.toString();
+  }
 }

plugins/git4idea/src/git4idea/ui/branch/GitBranchWidget.java

@@ -43,11 +43,13 @@ public class GitBranchWidget extends EditorBasedWidget implements StatusBarWidge
   private final GitVcsSettings mySettings;
   private volatile String myText = "";
   private volatile String myTooltip = "";
+  private final String myMaxString;
 
   public GitBranchWidget(Project project) {
     super(project);
     GitRepositoryManager.getInstance(project).addListenerToAllRepositories(this);
     mySettings = GitVcsSettings.getInstance(project);
+    myMaxString = "Git: Rebasing master";
   }
 
   @Override
@@ -108,7 +110,7 @@ public class GitBranchWidget extends EditorBasedWidget implements StatusBarWidge
   @NotNull
   @Override
   public String getMaxValue() {
-    return "Git: Rebasing abcdefghij";
+    return myMaxString;
   }
 
   @Override
@@ -142,7 +144,8 @@ public class GitBranchWidget extends EditorBasedWidget implements StatusBarWidge
           return;
         }
 
-        myText = GitBranchUiUtil.getDisplayableBranchText(repo);
+        int maxLength = myMaxString.length() - 1; // -1, because there are arrows indicating that it is a popup
+        myText = StringUtil.shortenTextWithEllipsis(GitBranchUiUtil.getDisplayableBranchText(repo), maxLength, 5);
         myTooltip = getDisplayableBranchTooltip(repo);
         myStatusBar.updateWidget(ID());
         mySettings.setRecentRoot(repo.getRoot().getPath());