RFR: 8375573: JTable ignores setPreferredWidth during initial layout when AUTO_RESIZE_LAST_COLUMN is enabled

[Tejesh R]

On Mon, 19 Jan 2026 02:18:06 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> AUTO_RESIZE_LAST_COLUMN handling was done in [JDK-8234071](https://bugs.openjdk.org/browse/JDK-8234071) but it didn't honour the preferred width if it is already been set for each column so when layouting is done, it only sees the `resizingColumn` 
> is set to AUTO_RESIZE_LAST_COLUMN and adjust only the last column and distribute width equally to all other column.
> 
> Fix is made to honour the user-set preferred column width even if auto-resize mode is set to LAST_COLUMN

src/java.desktop/share/classes/javax/swing/JTable.java line 3206:

> 3204:             if (columnModel.getColumn(i).getPreferredWidth() != 75
> 3205:                     && columnModel.getColumn(i).getWidth() == 75) {
> 3206:                 prefWidthSet = true;

Can break the loop for first true condition instead of iterating through all the columns ?

test/jdk/javax/swing/JTable/TestJTableColWidth.java line 81:

> 79:                 }
> 80:             } finally {
> 81:                 if (frame != null) {

Normally we do this inside EDT.

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/29291#discussion_r2716258542
PR Review Comment: https://git.openjdk.org/jdk/pull/29291#discussion_r2716261586