GNMIDI

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listbox multiextended selections
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Some listboxes in GNMIDI support multiextended selecting to comfortable select one or more list items.

Select only a single list item
click with left mouse button on a list item and release it will remove all other selections and select only this list item  
with arrow keys up and down the selection could be moved to previous or next list item  

 Select a range of adjacent list items
start by click with left mouse button on first list item and drag the mouse up or down while holding the mouse button clicked will remove all other selections and select a range of adjacent list items.  
Release the mouse button when you are ready  

 Extend or reduce the current selections by single list item
hold the CTRL key and click on a list item. The item will be added or removed from the selection depending if the item was selected before

Extend or reduce the current selections by a a range of list items
hold the CTRL key and click on first list item and drag the mouse up or down while holding the mouse button clicked. Unselected items will become selected and selected items will become unselected.  
Release the mouse button when you are ready  


 Replace selection to a range of adjacent items
hold the SHIFT key and click on a list item. That will select the items from the most recently selected item till the clicked item.  
All other items become unselected.  
Use the arrow up/down keys or the page up/down keys to select more items while holding the SHIFT key.  

 Select all items in the listbox
First select the first list box item. Hold the SHIFT key and use END key to select all items till last row  

 Select no item in the list box
Click into any list box item to select only this item. Then use CTRL and click into this listbox item to unselect this item.  


Hint: Few listboxes in GNMIDI use the simple selection mode. With that boxes you can only click and select or unselect the clicked entries.