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If the "Type" field is too long to fit the column in the "Change Method Parameter" dialog, it cannot be edited because moving the cursor left it gets out of the visible part of the cell. I'm pretty sure that in previous versions of netbeans the cell content used to scroll horizontally.
Reproducible
changeset: 9cd930c491be user: Ralph Benjamin Ruijs <ralphbenjamin@netbeans.org> date: Tue Mar 24 13:32:30 2015 +0100 summary: #237812 - Cursor not visible in "Change Method Parameter" dialog
Integrated into 'main-silver', will be available in build *201503250001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/9cd930c491be User: Ralph Benjamin Ruijs <ralphbenjamin@netbeans.org> Log: #237812 - Cursor not visible in "Change Method Parameter" dialog