RFR: 4834298: JFileChooser.getSelectedFiles() failed with multi-selection and double-click [v3]

[Tejesh R]

On Thu, 8 Sep 2022 10:25:13 GMT, Tejesh R <tr at openjdk.org> wrote:

>> src/java.desktop/share/classes/sun/swing/FilePane.java line 1766:
>> 
>>> 1764:                 selectedFiles[0] = getFileChooser().getSelectedFile();
>>> 1765:             }
>>> 1766: 
>> 
>> Is this problem seen only when single file is selected? What happens when more than one file is selected?
>> By default, is MultiSelection enabled on JfileChooser?
>> 
>> In FilePane.java, i see that get/setSelectedFiles() is exclusively used when multi-selection mode is enabled and get/setSelectedFile() is used when multi-selection is not enabled. Using getSelectedFile() to change the state when multi-selection is enabled might introduce state corruption issues in other scenarios.
>
> This problem occurs when user switch the mode from single selection to multi selection, that too on specified scenario. By default multiselection will be disabled. When user selects a file in single selection and then switch to multi selection the selected single file is not retained in selectedFiles (Even though its a single file). So In order to handle this situation, whenever user switch from any state to multiselection enabled state, the previously selected files(if present) is set to selectedFiles().

Other state are not altered or modified during the process, just the selected files are set to setSelectedFiles.

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PR: https://git.openjdk.org/jdk/pull/9996