RichardWaiteSTFC

### Description of work Use mantid fitting in `IntegratePeaks1DProfile` for speed. Previously scipy fitting used, but the only minimizer that worked robustly was a simplex/Nelder-Mead method which was very slow...

### Description of work Add `PearsonIV` function - will be used to model prompt pulse on HRPD. Related to #37528 (but does not fix) ### To test: (1) Load HRPD...

Requested by HRPD

**Is your feature request related to a problem? Please describe.** POLARIS want to distinguish the reduction for instances when the chopper is stopped but they want to do rietveld refinements...

**Is your feature request related to a problem? Please describe.** Q-space integration methods save the peak shape (sphere or ellipsoid) on the peak. For example `PeakShapeEllipsoid` here https://github.com/mantidproject/mantid/blob/b7e0aaf70396afde9e7b1e83112f42e5372d2e13/Framework/DataObjects/src/PeakShapeEllipsoid.cpp#L16 This peak...

**Problem** As a (SXD) user I want to be able to measure multiple samples simultaneously - to this end I need the reduction class to be able to handle this...

**Is your feature request related to a problem? Please describe.** `IntegratePeaks1DProfile` sometimes will successfully fit e.g. 1 pixel in a peak, but fail for the neighbours. In this case it's...

**Describe the outcome that is desired.** It has been found during smoke testing (#38241 and #38217) that fitting an exponential decay to the EMU data in the instructions is quite...

Can set Max < Min on axes limits of internal plot of Muon Analysis GUI

1

Found during manual testing #37989 To repdocue: (1) Follow first 4 steps in [HIFI Transverse Field Simultaneous Fitting](https://developer.mantidproject.org/Testing/MuonAnalysis_test_guides/Muon_HIFI.html#id2) (2) Set `YMax, YMin = YMin, YMax` on bottom of internal plot...

Cancel during MaxEnt calculation in Muon FDA interface opens pop-up with too much text/info

1

**Describe the bug** Clicking cancel button during MaxEnt calculation shows a pop-up with keyboard interrupt error text which is a bit off-putting! **To Reproduce** (1) Follow instructions in [Maxent Test](https://developer.mantidproject.org/Testing/MuonAnalysis_test_guides/Muon_FDA.html#id6)...