11

With the calculator runner in krunner, after you do a calculation you can hit enter to put the result back into the text input field, allowing you to do further calculations. So for instance if you type "=5+4" and hit enter, the area where you type the text in will read "=9". My idea is that when you hit enter, the previous calculation (=5+4) is placed below the current results. If the list of calculations gets too long, you can scroll down to see previous ones. If you want to re-do a previous calculation, you can just click on it or navigate down to it using the tab button to put it back in the text input box. The current calculator runner only takes up one line, there is a lot of empty space that is just not being used.

As an example, you start with this (the brackets represent the text you typed):

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[ =5+4 ]
9

You hit enter and you get this:

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[ = 9 ]
9
1: =5+4

Type something else:

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[ =9*11 ]
99
1: = 5+4

Hit enter:

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[ = 99 ]
99
2: = 9*11
1: = 5+4

And so on:

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[ =log(99) ]
4.59511985013459
2: = 9*11
1: = 5+4

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[ = 4.59511985013459 ]
4.59511985013459
3: = log(99)
2: = 9*11
1: = 5+4

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[ =sin(4.59511985013459) ]
-0.9931318518859471
3: = log(99)
2: = 9*11
1: = 5+4

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[ =-0.9931318518859471 ]
-0.9931318518859471
4: = sin(4.59511985013459)
3: = log(99)
2: = 9*11
1: = 5+4

etc.