using one signal to update multiple multiple controls

[ChrisW67]

When you call

qsb_fov_min_x->setValue(fov_min_x)

qsb_fov_min_x->setValue(fov_min_x)

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in resetFOV() you will cause update() to run via the valueChanged() signal. If update() changes any of fov_* members variables, for example reading all the slider values into the variables, then the next call to setValue() may not be using the value you think it is.