====== Design ======
===== Duration Tab =====
This feature is going to have a grid of duration buttons approximately thus

[][][][][][][][][x]1
[][][][][][][][][x]2
[][][][][][][][][x]3
[][][][][][][][][x]4
[][][][][][][][][x]5
[][][][][][][][][x]6
[][][][][][][][][x]7
[][][][][][][][][x]8
a b c d e f g h i

[all][none]

1: breves
2: whole notes (semibreves)
3: half notes (minims)
4: quarter notes (crotchets)
5: 8th notes (quavers)
6: 16th notes (semiquavers)
7: 32nd notes (demisemiquavers)
8: 64th notes (hemidemisemiquavers)

a: plain notes
b: dotted
c: double dotted
d: note triplet modifier
e: plain rests
f: dotted rests
g: double dotted rests
h: rest triplet modifier
i: entire row on/off

===== Thoughts =====
Do I need an entire column on/off too?

I wonder how notes will fall through the cracks, even with this many choices.

Needs to have "performance duration is [longer|shorter]" controls.

Have given no thought to pitch selection yet.

Marks: make icons for all possible marks in like fashion
Do we want to search for specific text strings?  Regexes?  At the moment, I just plan to search for text as a category and pick everything that has a text mark, regardless of what it says.
etc.

===== Duration use cases =====
==== Case 1 ====
Rosegarden has rendered a lot of double dotted 8th notes that want to be quarter notes.  The objective of the operation is to find all of those notes and change them.

Edit -> Search and Select...
User wants to end up with only the 8.. note button pushed, so starts with [none] button
Click on 8.. button
Search and select is performed
Ctrl+4
Mission accomplished