setClearWhitespaceLinesEnabled doesn't work if auto-indent is disabled

[pskowronek]

Description
When setClearWhitespaceLinesEnabled is enabled and setAutoIndentEnabled is disabled then spaces are not being cleared when Enter is hit.

Steps to Reproduce

• Modify src/main/java/org/fife/ui/rsyntaxtextarea/demo/DemoRootPane.java in the following way:

--- a/RSyntaxTextAreaDemo/src/main/java/org/fife/ui/rsyntaxtextarea/demo/DemoRootPane.java
+++ b/RSyntaxTextAreaDemo/src/main/java/org/fife/ui/rsyntaxtextarea/demo/DemoRootPane.java
@@ -210,7 +210,10 @@ public class DemoRootPane extends JRootPane implements HyperlinkListener,
                textArea.requestFocusInWindow();
                textArea.setMarkOccurrences(true);
                textArea.setCodeFoldingEnabled(true);
-               textArea.setClearWhitespaceLinesEnabled(false);
+               textArea.setWhitespaceVisible(true);
+               textArea.setClearWhitespaceLinesEnabled(true);
+               textArea.setTabsEmulated(true);
+               textArea.setAutoIndentEnabled(false);
 
                InputMap im = textArea.getInputMap();
                ActionMap am = textArea.getActionMap();

• run ./gradlew RSyntaxTextAreaDemo:run
• go to empty line, add some spaces and hit enter

Expected behavior
The spaces are cleared when enter is hit.

Actual behavior
The spaces are left uncleared.

Screenshots

Java version

java 14.0.2 2020-07-14
Java(TM) SE Runtime Environment (build 14.0.2+12-46)
Java HotSpot(TM) 64-Bit Server VM (build 14.0.2+12-46, mixed mode, sharing)

OS
macOS 10.15.7

Additional context

Additional remarks:

• when auto-indent is on, the line is cleared and spaces are being 'moved' to new line - probably this is expected behavior? Or not?
• is there any option btw to remove trailing spaces?

[bobbylight]

Thanks for reporting this! To answer your questions:

when auto-indent is on, the line is cleared and spaces are being 'moved' to new line - probably this is expected behavior? Or not?

Yes, the idea with that combination is the indent of the prior line (being cleared) is the indent that should be used for subsequent lines, so it is essentially moved to the new line.

is there any option btw to remove trailing spaces?

Not currently, but feel free to open a new feature request if you'd be interested in this. Would you expect something to happen with each Enter press, or some sort of action that could be executed on say file save (or any arbitrary event)_?